feat(tess): add configurable pi interaction service

packages/mosaic/framework/tools/fleet/start-interaction-service.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+AGENT_NAME=${1:-}
+
+fail() {
+  echo "ERROR: $*" >&2
+  exit 64
+}
+
+[ -n "$AGENT_NAME" ] || fail "agent name argument is required"
+[[ "$AGENT_NAME" =~ ^[A-Za-z0-9_.-]+$ ]] || fail "agent name contains unsupported characters"
+[ "${MOSAIC_AGENT_NAME:-}" = "$AGENT_NAME" ] || fail "configured agent name must exactly match the service instance"
+[ "${MOSAIC_AGENT_RUNTIME:-}" = "pi" ] || fail "operator interaction service requires runtime pi"
+[ "${MOSAIC_AGENT_MODEL:-}" = "openai/gpt-5.6-sol" ] || fail "operator interaction service requires the pinned model"
+[ "${MOSAIC_AGENT_REASONING:-}" = "high" ] || fail "operator interaction service requires high reasoning"
+[ "${MOSAIC_AGENT_TOOL_POLICY:-}" = "operator-interaction" ] || fail "operator interaction service requires the operator-interaction tool policy"
+
+exec "$(cd -- "$(dirname -- "$0")" && pwd)/start-agent-session.sh" "$AGENT_NAME"